Update changelog for 3.0.0

[Awk34]

#3.0.0

#### New Features

 * Sequelize Model Support
 * Mongoose Bluebird Promises
 * Babel
 * Lusca Security Middleware
 * Auth Module
 * OAuth buttons directive
 * Controller As and ES6/ES7 classes

#### Breaking Changes

 * Node 0.12 & 4.2.1
 * Removed CoffeeScript and vanilla JS support
 * Removed back-compat support code

[Awk34]

@kingcody lets start going through the things we need to include in the changelog for 3.0.0. Feel free to edit the text above.